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Does sitting in a sauna actually stimulate weight loss?Are you sure about burning fewer calories in a sauna? The ideal body temperature is 98F, and the human body will work rather hard to stay as close to that as possible. It strikes me that it would be far less difficult to warm oneself from ~70F ambient temperature to 98F internal than it would be to cool oneself from ~150F (or more!) ambient temperature to 98F internal. I'd also be skeptical about burning mass calories simply by being in a sauna, but even the act of sweating has metabolic processes associated with it.